Article
Physics, Applied
O. E. Petukhova, A. S. Klepikova, M. R. Popov, N. G. Shelushinina, A. A. Ivanov, T. B. Charikova
Summary: The study investigates the carrier transport and vortex system motion in an electron-doped high-temperature superconductor Nd2-xCexCuO4. By synthesizing Nd2-xCexCuO4/SrTiO3 epitaxial films with non-standard orientations, the crucial role of the Lorentz force on the motion of Josephson vortices across CuO2 layers in the mixed state is revealed. The anisotropy of galvanomagnetic effects in the highly layered NdCeCuO system is mainly determined by the perpendicular component of the magnetic field relative to the current.
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
(2021)
Article
Nanoscience & Nanotechnology
A. S. Klepikova, T. B. Charikova, M. R. Popov, E. A. Stepanova, A. A. Ivanov
Summary: This study investigated the mass magnetic susceptibility and resistivity of electron-doped Nd2-xCexCuO4+delta/SrTiO3 epitaxial films with different orientations of the c-axis at various cerium concentrations and oxygen content. It was found that there was a strong anisotropy in resistivity and mass magnetic susceptibility at an applied magnetic field of 100 Oe, which was associated with the presence of excess oxygen atoms between the conducting planes CuO2. An increase in nonstoichiometric oxygen content resulted in an increase in mass magnetic susceptibility and the destruction of the superconducting state.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Anita Guarino, Carmine Autieri, Pasquale Marra, Antonio Leo, Gaia Grimaldi, Adolfo Avella, Angela Nigro
Summary: In this study, the occurrence of superconductivity in oxygen-deficient Nd2-xCexCuO4 thin films grown in an oxygen-free environment after annealing in pure argon flow is reported. X-ray diffraction and first-principles density functional theory calculations reveal that annealing induces a migration of oxygen ions to apical positions, resulting in a redistribution of oxygen ions and a modulation of the electronic band structure, suppressing antiferromagnetic order and allowing hole superconductivity to emerge.
Article
Chemistry, Multidisciplinary
A. S. Klepikova, T. B. Charikova, M. R. Popov, E. A. Stepanova, A. A. Ivanov
Summary: The study revealed that the epitaxial films with different orientations exhibit significant magnetic differences under an external magnetic field, mainly due to the different magnetic orders of Nd3+ (Ce4+) rare earth magnetic ions and copper ions in different directions.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Multidisciplinary Sciences
Menghan Liao, Yuying Zhu, Shuxu Hu, Ruidan Zhong, John Schneeloch, Genda Gu, Ding Zhang, Qi-Kun Xue
Summary: Understanding the rich and competing electronic orders in cuprate superconductors may provide important insight into the mechanism of high-temperature superconductivity. Here, the authors report a distinct charge order with Little-Parks like resistance oscillations at magnetic fields up to 10 T and around Tc in lightly doped Bi2Sr2CaCu2O8+x.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
C. Y. Tang, Z. F. Lin, J. X. Zhang, X. C. Guo, Y. G. Zhong, J. Y. Guan, S. Y. Gao, Z. C. Rao, J. Zhao, Y. B. Huang, T. Qian, Z. Y. Weng, K. Jin, Y. J. Sun, H. Ding
Summary: In this study, in situ ARPES measurements were performed on La2-xCexCuO4+/-delta (LCCO) thin films, revealing the phenomenon of the kink in the band dispersion of cuprates at different electron doping levels. An antinodal kink above 200K was observed, independent of doping level.
NPJ QUANTUM MATERIALS
(2022)
Article
Metallurgy & Metallurgical Engineering
T. B. Charikova, N. G. Shelushinina, A. S. Klepikova, M. R. Popov
Summary: This paper provides a brief review of the transport and galvanomagnetic properties of an electron-doped Nd2-xCexCuO4 layered superconductor, focusing on the role of the structure of Josephson vortices formed in the crystal in a magnetic field oriented parallel to the CuO2 planes. The experimental data on the longitudinal and Hall magnetoresistance of the recently synthesized Nd2-xCexCuO4/SrTiO3 epitaxial films are analyzed. The unique orientation of the c axis and the conducting CuO2 planes of the Nd2-xCexCuO4 compound with respect to the substrate plane determines the possibility of forming a system of Josephson vortices in this highly anisotropic system.
PHYSICS OF METALS AND METALLOGRAPHY
(2023)
Article
Chemistry, Multidisciplinary
Yati Maryati, Suci Winarsih, Muhammad Abdan Syakuur, Maykel Manawan, Togar Saragi, Risdiana
Summary: In this study, electron-doped superconducting cuprate of Eu2-xCexCuO4+alpha-delta was investigated to explore the relation between crystal structure and hopping conduction in the normal state. It was found that the Eu-O bond length decreases with increasing doping concentration, indicating successful doping. The resistivity increases with decreasing temperature, suggesting a bad metal-like behavior. The temperature dependence of resistivity was analyzed using the Arrhenius law and the variable range hopping model, with the latter showing a better fit to the experimental data.
Article
Materials Science, Multidisciplinary
K. W. Post, A. Legros, D. G. Rickel, J. Singleton, R. D. McDonald, Xi He, I Bozovic, X. Xu, X. Shi, N. P. Armitage, S. A. Crooker
Summary: Using time-domain terahertz spectroscopy in pulsed magnetic fields up to 31 T, the study measured the terahertz optical conductivity in an optimally doped thin film of the high-temperature superconducting cuprate La1.84Sr0.16CuO4, revealing systematic changes in the circularly polarized complex optical conductivity consistent with cyclotron absorption of p-type charge carriers. This opens up opportunities for investigating the influence of electron-electron interactions on carrier masses in cuprate superconductors.
Article
Chemistry, Physical
Bruno Cury Camargo, Banan El-Kerdi, Andrei Alaferdov, Shahar Zuri, Magdalena Birowska, Walter Escoffier
Summary: We demonstrate that mechanical deformation of graphite through cavity shock waves can generate a new set of charge carriers, with significantly higher effective mass and native concentration compared to the pristine material. These carriers, however, still exhibit quasi-2D behavior. Our findings highlight the potential of defects introduced during mechanical exfoliation to induce oscillatory behavior above 50 T in graphite, offering a new avenue for studying field-induced electronic phase transitions in this material.
Article
Multidisciplinary Sciences
Kifu Kurokawa, Shunsuke Isono, Yoshimitsu Kohama, So Kunisada, Shiro Sakai, Ryotaro Sekine, Makoto Okubo, Matthew. D. D. Watson, Timur. K. K. Kim, Cephise Cacho, Shik Shin, Takami Tohyama, Kazuyasu Tokiwa, Takeshi Kondo
Summary: By studying the inner CuO2 planes of a six-layered compound, the authors find that even the slightest amount of carriers can turn a Mott insulating state into a metallic state with long-lived quasiparticles. Furthermore, they observe a phase transition from the superconducting to the metallic states at 4% doping.
NATURE COMMUNICATIONS
(2023)
Article
Metallurgy & Metallurgical Engineering
A. S. Klepikova, O. E. Petukhova, M. R. Popov, N. G. Shelushinina, T. B. Charikova
Summary: This paper presents the results of studies on the temperature and field dependences of resistivity tensor in the electron-doped superconductor Nd2-xCexCuO4. It is found that the system exhibits high metallic conductivity in the CuO2 conducting planes and nonmetallic temperature dependence of conductivity in the c-axis direction. Additionally, the behavior of magnetoresistivity and Hall resistivity in the mixed state is related to the dynamics of Abrikosov and Josephson vortices in crossed electric and magnetic fields.
PHYSICS OF METALS AND METALLOGRAPHY
(2022)
Article
Chemistry, Multidisciplinary
Jessie Manopo, Tio Prince Lubis, Muhammad Arief Mustajab Enha Maryono, Pepen Arifin, Toto Winata, Rena Widita, Yudi Darma
Summary: We studied the electronic, magnetic, and optical properties of (LaO1-xFx)MnAs systems with different doping levels of F. The properties of the system, such as bandgap and magnetism, were found to change significantly with F doping. This research highlights the potential of F doping for advanced device applications.
Article
Chemistry, Multidisciplinary
Yati Maryati, Suci Winarsih, Muhammad Abdan Syakuur, Maykel Manawan, Togar Saragi, Risdiana
Summary: In this study, the crystal structure and the conduction behavior in the normal state of electron-doped superconducting cuprate of Eu2-xCexCuO4+alpha-delta were investigated by reducing the oxygen content in the whole doping regime. It was found that the Eu-O bond length decreases with increasing doping concentration, indicating successful doping. The resistivity was found to increase with decreasing temperature, and the hopping conduction mechanism was more likely to follow the variable range hopping model.
Article
Physics, Multidisciplinary
Rong Li, Zhen-Su She
Summary: The authors suggest that the pseudogap in cuprates is governed by a unified energy law based on the theory of wall turbulence. They report a quantitative relationship between scattering rate, pseudogap energy, and its onset temperature, determined by the wavevector of density wave order. The energy law also explains the linear scalings for the resistivity of the strange metal phase and the transition temperature of the superconducting phase.
COMMUNICATIONS PHYSICS
(2022)
